Global Patent Index - EP 0197453 A1

EP 0197453 A1 19861015 - Method for improving the picture quality of DPCM-coded picture signals.

Title (en)

Method for improving the picture quality of DPCM-coded picture signals.

Title (de)

Verfahren zur Verbesserung der Bildqualität bei DPCM-codierten Bildsignalen.

Title (fr)

Procédé pour améliorer la qualité d'image pour des signaux d'images codés par modulation d'impulsions codées.

Publication

EP 0197453 A1 19861015 (DE)

Application

EP 86104259 A 19860327

Priority

DE 3511714 A 19850329

Abstract (en)

1. Method for improving the picture quality, in which digitized picture signal values (s) are converted into quantized DPCM values (DELTA sq ), using a multidimensional, particularly a two-dimensional prediction and switchable quantization characteristics (QK1 to QK4), characterized in that in each case at least one reconstructed picture signal value (sr = X0 ) is temporarily stored and output with delay on the receiving side, and that on reception of a DPCM value (DELTA s) which corresponds to the maximum value (MA1, MA2, ...) of a quantization range of the quantization characteristic (QK1, QK2, ...) used, instead of the picture signal value (X0 ) reconstructed with the aid of this DPCM value (DELTA s = MA1, MA2, ...), a correction value (XK) is output which has been determined from subsequent picture signal values (X9 , X10 , X11 ) and, if necessary, additionally from the picture signal value (X0 ) to be corrected.

Abstract (de)

Verfahren zur Verbesserung der Bildqualität bei mit unterschiedlichen Quantisierungskennlinien codierten DPCM-Bildsignalen, bei dem bei Empfang der Maximalwerte MA einer feinen Quantisierungskennlinie QK1 die entsprechenden kritischen Bildsignalwerte X0 durch Korrekturwerte XK ersetzt werden.

IPC 1-7

H04N 7/137

IPC 8 full level

H04N 7/32 (2006.01); H04N 19/124 (2014.01); H04N 19/50 (2014.01)

CPC (source: EP)

H04N 19/124 (2014.11); H04N 19/50 (2014.11)

Citation (search report)

  • [A] DE 2559263 A1 19770707 - DEUTSCHE FORSCH LUFT RAUMFAHRT
  • [A] DE 3311911 A1 19841004 - SIEMENS AG [DE]
  • [A] US 4430670 A 19840207 - NETRAVALI ARUN N [US]
  • [A] EP 0104963 A1 19840404 - THOMSON CSF [FR]
  • [A] EP 0095838 A2 19831207 - SONY CORP [JP]
  • [A] TAGUNGSBAND - 10. JAHRESTAGUNG DER FERNSEH- UND KINOTECHNISCHEN GESELLSCHAFT, 13.-17. September 1982, München, Seiten 526-548, Mainz, DE; D. WESTERKAMP et al.: "Digital Magnetbandaufzeichung von Video- und Audiosignalen auf einem Videocassettenrecorder"
  • [A] CONFERENCE RECORD ON THE IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, 13.-17. Juni 1982, Philadelphia, Band 2, Seiten 3G.2.1 - 3G2.5, IEEE, New York, US; C.J. HWANG et al.: "Channel error propagation in adaptive DPCM coders"

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI NL SE

DOCDB simple family (publication)

EP 0197453 A1 19861015; EP 0197453 B1 19890816; AT E45656 T1 19890915; DE 3511714 A1 19861009; DE 3665121 D1 19890921

DOCDB simple family (application)

EP 86104259 A 19860327; AT 86104259 T 19860327; DE 3511714 A 19850329; DE 3665121 T 19860327